Strain clamp



8- 1933- c. w. KEMPER El AL 1,924,438

STRAIN CLAMP Filed June 13. 1952 INVENTOR.

BY 100M '1". KEMflEI? ATTORNEYS.

CHARLES W KEMPE/P- Patented Aug. 29, 1933 Charles W.

' STRAIN CLAMP 'Kemper and JohnT. Kemper; Hayward, Calif.

- Application June 13,1932. Serial; 1m, 616, 15

r 8 Claims. (01.24- 1 3 This invention relatesv to cable" clamping devices of the type shown in our US. Patent No. 1,811,942, and has for its objects improvements over the former structure whereby the device will meet the requirements-of a strainclamp as required for power andother lines supported on poles.

In the drawing Fig. 1 is a side view of our improved cable clamp. a

Fig.2 is a vertical section of the clamp of Fig. l. i

Fig. 3 is an elevation showing the upper portion of a line pole with two of our improved clamps in position on a high power electric cable.

Fig. 4 is across section of Fig. 1 taken along the line 44 thereof.

Fig. 5 is a cross section of Fig. 1 taken along the'line 5-5 thereof. ,i

In further detail the device comprises an inverted U-shaped metal shell 1 provided with an outwardly slanted portion 2 and a pair of rearwardly extendig ears 3-pierced with aligned holes to receive a pin 4 of a yoke 5 Mother connec-.

tion extending from a series of insulators 6 connected to the pole 7 as at 8. i

This shell 2 is the main body member of the clamp and it is formed with hinge eyelets or loops 9 formed along both edges and spaced to receive between them similar eyelets 10 of a cover shell 11 which forms with shell 1 a channel for a cable 12. The extreme end of the channel is flared slightly larger than the cable as at 20,

' and at the opposite end just beyond the slanted portion 2 the cover shell 11 is curved downwardly or away from the axis of the device as at 1 1 so as to lead the cable as at 12 away from the run of the cable within the channel so that it can hang in a -freeuntensioned loop between two clamps used on a pole or'may extend freely down (or up) to a transformer 13 carried on the pole and energized by the cable.

Within the larger U-shaped shell between the slanted wall 2 and the cable is a frictional pinching roller 14 preferably made of hard steel or extremelyhard alloys and provided with a serrated concave surface 14 as indicated so that.

it will tightly grip both cable and wall 2 as the pull on the cable is exerted indirection of the arrow. I I a This roller 14 is centrally apertured and fitted with a pin 15 projecting out beyond the sides of the roller into slots or recesses 16 formed in thelopposite side walls of the ears 3, and which recesses are apertured for passage of a cotter The two U-shaped shells which form the cable 7 permitting it to be punched out if required.

- line Wire or cable as shown' in Fig. 3 it willbe cover plate for the open side of the shellremovpin 17 which may beinserted to holdtheroller in released position as dottedat 14 'or in the locked position of the roller shown'in the draw channel are connected togetherby parallel hinge pins 18 passing through-the eyelets or loops 9, l0, and one of these pins is'permanently headed over, but the other is headed at one endonly to start so that'it may be easily withdrawn to swing the shells open on the other pin, for free insertion'of. the cable, and when closed and-the loose pin is reinserted througl'i the eyelets it may be headed over slightly to prevent losing though firmly into the wedge-like housing so as tofg rip both the roller and the housing against any danger of slippage, in fact the greater the subsequent pull on the cable the better the roller grips.

Cotter pin 17 may then be passed through back of the roller as additional safety. 'A' hole 19 is provided in the main shell 1 for punching the roller back if ever required to release the cable. I r

It'will be noted that the slight flaring or the outer end of the cable channel at 20 permits vibration of the cable relative to the clamp without setting up objectional crystallization effects or scoring of the cable at that point. Y

When the clamps are in use ona transmissio seen that the coupling pin 4 is substantially in f line with the pull or'tensioned run of the cable, and that the inner run of the cable falls freely out of the line of tension.

It is evident from what has been described that the clamp maybe made of, anysize or for more than one. cable and that the roller isfa; form of wedge which may take other forms while still realizing other advantages oi the in.- vention. I

'We claim: 7 r Y v l. A cable strain clamp comprising an elongated body shell U-shape in cross section, and a ably secured thereto, a suspension connection at one end of said shell, said cover plate terminating in a position to permitdeflection of a cable in a device away from said connection, and means within the body shell movable in a direction generally longitudinally thereof for clamp- ,ing the cable at a point within the body.

2.A cable strain clamp comprising an elongated body shell U-shape in cross section, and a cover plate for the open side of the shell, means holding the cover plate in place, an enlarged portion on said U-shaped shell forming a housing, means within the housing for clamping a cable within thebody, and a coupling connection at the end of the body adjacent the clamping means.

3. A cable strain clamp comprising an elongated body shell U-shape in cross section, and

a cover plate for the open side of the shell, means holding the cover plate in place, an enlarged portion on said U-shaped shell forming a housing, means Within'the housing for clamping a cable within the body, and a coupling connection at the end of the body adjacent the clamping means substantially'in line with th I run of the cable through said body. 7

4. A cable strain clamp comprising .an elongated body shell u -shape in cross section, and a cover plate for the open sideof the shell, means holding the cover plate in place, an enlarged portion on said 'U-shaped shell forming a housing, means within-the housing for clamping a cable within, the body, a coupling connection at the end, of the body adjacent the clamping means substantially in line with the run of, the cable through said body, and said ,cover plate formed with an extending end curved to guide the cable'outwardly. r

ripheral surface adapted to engage a side of the 7 cable. I V

7. A cable clamp comprising a pair of elongated members: each being U-shaped incross section, said members arranged with their concave sidesin parallel confronting relation and hinged together along one of their sides,removable meansin the side opposite the hinge securing the members together with their concave sides in said opposed relation, one of said members provided'with an enlargement at an end thereof forming a, housing, means ,within said housing clamping a cable Withinv the members and means at an end of the opposite member adapting the cable to be diverted from its main run. s

r 8. A cable clamp as defined in claim '7 provided with a suspension connection secured to a the member that carries the means for clamping a cable within the members. 1

CHARLES W. KEMPER. JOHN T. KEMPER.

QERTHFIGATE 0F GQRRECTION.

Patent No. 1,924,438. August 29, 1933.

CHARLES W. KEMPER, ET AL.

It is hereby certified that error appears in the printed specification 0f the above numbered patent requiring wrrecrimr as feiiews: Page 1, line 109 claim 3., for the article "a" read the; and than: the said Letters larent simuid be read with this currection therein that the same may canifirm m the record of the casc in the Patent Office.

Signed and sealed this 55%! day of November, A. D. 1935.

Leslie Frazer (Seal) Acting fiommissioner 0f Patents. 

